Imported Upstream version 1.4upstream/1.4

1 files changed, 58 insertions, 0 deletions

diff --git a/src/os/dir_unix.go b/src/os/dir_unix.go
new file mode 100644
index 000000000..589db8527
--- /dev/null
+++ b/src/os/dir_unix.go
@@ -0,0 +1,58 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build darwin dragonfly freebsd linux nacl netbsd openbsd solaris
+
+package os
+
+import (
+	"io"
+	"syscall"
+)
+
+const (
+	blockSize = 4096
+)
+
+func (f *File) readdirnames(n int) (names []string, err error) {
+	// If this file has no dirinfo, create one.
+	if f.dirinfo == nil {
+		f.dirinfo = new(dirInfo)
+		// The buffer must be at least a block long.
+		f.dirinfo.buf = make([]byte, blockSize)
+	}
+	d := f.dirinfo
+
+	size := n
+	if size <= 0 {
+		size = 100
+		n = -1
+	}
+
+	names = make([]string, 0, size) // Empty with room to grow.
+	for n != 0 {
+		// Refill the buffer if necessary
+		if d.bufp >= d.nbuf {
+			d.bufp = 0
+			var errno error
+			d.nbuf, errno = fixCount(syscall.ReadDirent(f.fd, d.buf))
+			if errno != nil {
+				return names, NewSyscallError("readdirent", errno)
+			}
+			if d.nbuf <= 0 {
+				break // EOF
+			}
+		}
+
+		// Drain the buffer
+		var nb, nc int
+		nb, nc, names = syscall.ParseDirent(d.buf[d.bufp:d.nbuf], n, names)
+		d.bufp += nb
+		n -= nc
+	}
+	if n >= 0 && len(names) == 0 {
+		return names, io.EOF
+	}
+	return names, nil
+}